Been using sharpie to mark progesterone spots

Girls, I hope this ends up just being another silly paranoid question. I started progesterone shots weeks ago and got my bfp two weeks ago. I’m now 6 weeks. Well my clinic said they were going to give me a special marker to continue to mark where my progesterone shots go and never did so I didn’t think anything about using a sharpie to do so. Well today my husband said, I just thought about how we shouldn’t have been using sharpies because they can be toxic and they have special nurses markers for this. So now I’m freaking out thinking I’ve been poisoning my baby :( and of course I emailed my nurse but honestly they respond to everything saying “it should be fine” and then I’ll find out weeks later it’s not fine.